GitHub - LGTM is a free Chrome extension developed by victorvieux. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. This extension enhances the experience of using GitHub by providing several useful features.

Firstly, GitHub - LGTM adds a button that allows users to quickly give the "Looks Good To Me" (LGTM) approval on pull requests. This saves time and makes the code review process more efficient. Additionally, the extension displays a count of the number of LGTM approvals on the GitHub page, providing a clear overview of the review status.

One of the standout features of this extension is the ability to change the background color of the text "LGTM" to green and "NOT LGTM" to red. This visual representation helps in quickly identifying the approval status of pull requests. Furthermore, GitHub - LGTM displays an unstable style when a pull request has less than two LGTM approvals, indicating that further review is required.

Overall, GitHub - LGTM is a valuable extension for GitHub users, offering convenient LGTM functionality, clear visual indicators, and enhanced code review capabilities.